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Thread: Horrible Performance after Parallel 9 Upgrade

  1. #1

    Default Horrible Performance after Parallels 9 Upgrade

    I recently upgraded to Parallels 9 and to Mavericks. Prior to that I was using V7 with Mountain Lion. My Mac worked great and so did Parallels. However, after upgrading to V9, my Mac has become horribly slow. Just launching Safari on the Mac can take up to a minute. The computer is almost unusable. When I launch a Windows app in the virtual machine, performance is fine once the app is open. It seems that the hard disk disk is always spinning or swapping files. I can leave the computer for 2 hours. It's quite and the disk is still. When I click on any Mac app, it takes forever to open and the disk goes crazy. If I shut down Parallels, the Mac works great. So Parallels seems to be the cause.

    Is there anything I can do to fine tune the performance of Parallels? Perhaps some settings I can turn on or off?

    Last edited by RickMeister; Mar 29, 2014 at 01:36 PM.

  2. #2
    Parallels Support ManojD@Parallels's Avatar
    Join Date
    Jan 2014


    Hi RickMeister,

    Yes! You can tune up Windows Virtual Machine performance as suggested at


    Manoj D

  3. #3
    Kilo Poster
    Join Date
    Sep 2008


    I just upgraded to Parallels 9 on my iMAC running OS X 10.9.2 - Mavericks - and attest to the same issue. Everything slowed to a crawl on the iMAC as well as the programs I tried to run on Parallels. Not acceptable.

  4. #4
    Product Expert Specimen's Avatar
    Join Date
    May 2008
    Over your shoulder


    This is most likely related to an incorrect uninstall of the previous version/upgrade. Ask the Parallels Staff to guide you if a re installation of PDM9 does not resolve the issue.
    Parallels Desktop for Mac user since version 3.0
    Experience with OS X, Windows, Linux and BSD Operating Systems.

    . Always try to re-install Parallels Tools before reporting a problem:
    . Parallels Desktop download (same .dmg: trial/upgrade/full):
    . Previous versions download links:
    . Network troubleshooting:
    . Knowledge base, documentation and support options:
    [NOTE] I'm a Product Expert, that doesn't mean I'm affiliated with or work for Parallels.

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